Display apparatus and Anti-peeping method thereof

Abstract

This invention provides a display device and its anti-peeping method. The display device includes a display panel, an object tracker, a light source, a liquid crystal lens, and a control circuit. The liquid crystal lens is positioned in the path of interfering light generated by the light source. The control circuit uses the object tracker to track the legal viewing direction range corresponding to a viewer in front of the display panel. Based on the legal viewing direction range, the control circuit controls the liquid crystal lens to dynamically change the direction of the interfering light, so that the interfering light interferes with the view of the display panel from a peeping tom located in front of the display panel and outside the legal viewing direction range.

Claims

1. A display device, comprising: A display panel that displays an image; an object tracker that tracks a viewer on the front side of the display panel; A first interfering light source generates a first interfering light; A first liquid crystal lens is disposed in the path of the first interference light of the first interference light source; and a control circuit is coupled to the object tracker and the first liquid crystal lens, wherein the control circuit tracks a legal viewing direction range corresponding to the viewer in front of the display panel through the object tracker, and the control circuit controls the first liquid crystal lens according to the legal viewing direction range to dynamically change the direction of a first interference light of the first interference light, so that the first interference light interferes with the vision of a voyeur on the front side of the display panel and outside the legal viewing direction range of the display panel.

2. The display device as claimed in claim 1, wherein the first interference light source and the first liquid crystal lens are disposed on the front side of the display panel and around a display area of ​​the display panel.

3. The display device as claimed in claim 2, wherein the first liquid crystal lens directs the first interference light of the first interference light source toward the voyeur on the front side of the display panel in a direction away from the display panel.

4. The display device as claimed in claim 2, wherein the first interference light source and the first liquid crystal lens are disposed on a first side of the display area of ​​the display panel, and the display device further comprises: A second interfering light source generates a second interfering light; A second liquid crystal lens is disposed in the path of the second interference light of the second interference light source. The second interference light source and the second liquid crystal lens are disposed on the front side of the display panel. The second interference light source and the second liquid crystal lens are disposed on a second side of the display area of ​​the display panel, which is the opposite side of the first side. The control circuit controls the second liquid crystal lens according to the legal viewing direction range to dynamically change the direction of the second interference light, so that the second interference light interferes with the vision of a second voyeur on the front side of the display panel and outside the legal viewing direction range.

5. The display device as claimed in claim 4, wherein the first interference light and the second interference light are used to achieve a privacy protection function for a first sub-area in the display area of ​​the display panel, and the display device further comprises: A third interfering light source generates a third interfering light; A third liquid crystal lens is disposed in the path of the third interference light of the third interference light source, wherein the third interference light source and the third liquid crystal lens are disposed on the front side of the display panel, the third interference light source and the third liquid crystal lens are disposed on the first side of the display area of ​​the display panel, and the control circuit controls the third liquid crystal lens according to the legal viewing direction range to dynamically change the direction of the third interference light, so that the third interference light interferes with the vision of the voyeur on the front side of the display panel and outside the legal viewing direction range of the display panel; A fourth interference light source generates a fourth interference light; and a fourth liquid crystal lens is disposed in the path of the fourth interference light source, wherein the fourth interference light source and the fourth liquid crystal lens are disposed on the front side of the display panel, and the fourth interference light source and the fourth liquid crystal lens are disposed on the second side of the display area of ​​the display panel. The control circuit controls the fourth liquid crystal lens according to the legal viewing direction range to dynamically change the direction of the fourth interference light, so that the fourth interference light interferes with the vision of the second peeping tom on the display panel from the front side of the display panel and outside the legal viewing direction range. The third interference light and the fourth interference light are used to achieve the anti-peeping function of a first and second sub-area in the display area of ​​the display panel that is different from the first sub-area.

6. The display device as claimed in claim 4, wherein the direction of the first interfering light is different from the direction of the second interfering light, and the display device further comprises: A third interfering light source generates a third interfering light; A third liquid crystal lens is disposed in the path of the third interference light from the third interference light source, wherein the third interference light source and the third liquid crystal lens are disposed on the first side of the display area of ​​the display panel, and the control circuit controls the third liquid crystal lens according to the legal viewing direction range to dynamically change the direction of the third interference light, so that the third interference light interferes with the vision of a third voyeur on the display panel outside the legal viewing direction range, and the direction of the third interference light is different from the direction of the first interference light; a fourth interference light source generates a fourth interference light; and a fourth liquid crystal lens is disposed in the path of the fourth interference light from the fourth interference light source, wherein the fourth interference light source and the fourth liquid crystal lens are disposed on the second side of the display area of ​​the display panel, and the control circuit controls the fourth liquid crystal lens according to the legal viewing direction range to dynamically change the direction of the fourth interference light, so that the fourth interference light interferes with the vision of a fourth voyeur on the display panel outside the legal viewing direction range, and the direction of the fourth interference light is different from the direction of the second interference light.

7. The display device as claimed in claim 1, wherein the first liquid crystal lens, which is different from the display panel, comprises: A liquid crystal layer, wherein the first interfering light from the first interfering light source passes through the liquid crystal layer; A first electrode is disposed on a first side of the liquid crystal layer; A second electrode is disposed on the first side of the liquid crystal layer, wherein the first electrode and the second electrode provide a first directional electric field to change the long axis orientation of at least one liquid crystal molecule in the liquid crystal layer; and a third electrode is disposed on a second side of the liquid crystal layer, wherein the second side is an opposite side of the first side, and the first electrode and the third electrode provide a second directional electric field to change the long axis orientation of the at least one liquid crystal molecule in the liquid crystal layer.

8. The display device as claimed in claim 7, wherein the third electrode includes a microstructure to define a direction of the second directional electric field.

9. The display device as claimed in claim 1, wherein the display panel includes a liquid crystal display panel, and the display device further includes: A backlight module is disposed on a rear side of the display panel to provide backlight to the display panel.

10. The display device as claimed in claim 9, wherein the backlight module comprises: A light guide plate is disposed behind the display panel; a reflective sheet is disposed behind the display panel, wherein the light guide plate is disposed between the display panel and the reflective sheet; A backlight source is disposed behind the display panel and on one side of the light guide plate, wherein the backlight generated by the backlight source is provided to the display panel through the light guide plate; and a light path adjustment film is disposed behind the display panel, wherein the light path adjustment film is disposed between the display panel and the light guide plate, and a first side of the light path adjustment film has a first optical microstructure; a first interference light source and a first liquid crystal lens are disposed behind the display panel, wherein the backlight source serves as the first interference light source, the first liquid crystal lens is disposed between the backlight source and the light guide plate, the first liquid crystal lens directs a first portion of the light generated by the backlight source as the backlight onto the light guide plate, the first liquid crystal lens directs a second portion of the light generated by the backlight source as the first interference light, the first liquid crystal lens directs the first interference light toward the first optical microstructure of the light path adjustment film, and the first optical microstructure directs the first interference light toward a peeping tom outside the legal viewing direction of the display panel, so as to interfere with the peeping tom's view of the display panel.

11. The display device as claimed in claim 10, wherein the backlight module further comprises: A side reflector is disposed behind the display panel, wherein the side reflector and the backlight are respectively disposed on opposite sides of the light guide plate; A second liquid crystal lens is disposed between the side reflector and the light guide plate. The second side of the light path adjustment film has a second optical microstructure. The side reflector reflects a first portion of the light from the first liquid crystal lens and passing through the light guide plate as a second backlight. The second liquid crystal lens directs a third portion of the second backlight as a third backlight toward the light guide plate. The second liquid crystal lens directs a fourth portion of the second backlight as a second interference light. The second liquid crystal lens directs the second interference light toward the second optical microstructure of the light path adjustment film. The second optical microstructure directs the second interference light toward a second voyeur on the front side of the display panel and outside the legal viewing direction, so as to interfere with the second voyeur's viewing of the display panel.

12. A method for preventing peeping on a display device, comprising: An image is displayed on a display panel of the display device; Tracking the legal viewing direction range corresponding to a viewer on the front side of the display panel; generating a first interference light by a first interference light source of the display device, wherein a first liquid crystal lens of the display device is disposed in the path of the first interference light of the first interference light source; and controlling the first liquid crystal lens according to the legal viewing direction range to dynamically change the direction of a first interference light, so that the first interference light interferes with the vision of a voyeur on the front side of the display panel and outside the legal viewing direction range of the display panel.

13. The anti-peeping method as claimed in claim 12, wherein the first interference light source and the first liquid crystal lens are disposed on the front side of the display panel and around a display area of ​​the display panel.

14. The anti-peeping method as described in claim 13 further includes: The first liquid crystal lens directs the first interference light from the first interference light source toward the spy on the front side of the display panel along the direction of the first interference light rays away from the display panel.

15. The anti-peeping method as claimed in claim 13, wherein the first interference light source and the first liquid crystal lens are disposed on a first side of the display area of ​​the display panel, and the anti-peeping method further includes: A second interference light is generated by a second interference light source of the display device, wherein a second liquid crystal lens of the display device is disposed in the path of the second interference light source, the second interference light source and the second liquid crystal lens are disposed on the front side of the display panel, the second interference light source and the second liquid crystal lens are disposed on a second side of the display area of ​​the display panel, and the second side is the opposite side of the first side; and the second liquid crystal lens is controlled according to the legal viewing direction range to dynamically change the direction of the second interference light, so that the second interference light interferes with the vision of a second voyeur on the front side of the display panel and outside the legal viewing direction range of the display panel.

16. The anti-peeping method as claimed in claim 15, wherein the first interference light and the second interference light are used to achieve the anti-peeping function of a first sub-area in the display area of ​​the display panel, and the anti-peeping method further includes: A third interference light is generated by a third interference light source of the display device, wherein a third liquid crystal lens of the display device is disposed in the path of the third interference light source, the third interference light source and the third liquid crystal lens are disposed on the front side of the display panel, and the third interference light source and the third liquid crystal lens are disposed on the first side of the display area of ​​the display panel; the third liquid crystal lens is controlled according to the legal viewing direction range to dynamically change the direction of the third interference light, so that the third interference light interferes with the vision of the voyeur on the front side of the display panel and outside the legal viewing direction range; A fourth interference light is generated by a fourth interference light source of the display device, wherein a fourth liquid crystal lens of the display device is disposed in the path of the fourth interference light source. The fourth interference light source and the fourth liquid crystal lens are disposed on the front side of the display panel, and the fourth interference light source and the fourth liquid crystal lens are disposed on the second side of the display area of ​​the display panel. The fourth interference light source is controlled according to the legal viewing direction range to dynamically change the direction of the fourth interference light, so that the fourth interference light interferes with the vision of the second peeping tom on the display panel from the front side of the display panel and outside the legal viewing direction range. The third interference light and the fourth interference light are used to achieve the anti-peeping function of a first and second sub-area in the display area of ​​the display panel that is different from the first sub-area.

17. The anti-peeping method as claimed in claim 15, wherein the direction of the first interfering light is different from the direction of the second interfering light, and the anti-peeping method further includes: A third interference light is generated by a third interference light source of the display device, wherein a third liquid crystal lens of the display device is disposed in the path of the third interference light source, and the third interference light source and the third liquid crystal lens are disposed on the first side of the display area of ​​the display panel; the third liquid crystal lens is controlled according to the legal viewing direction range to dynamically change the direction of the third interference light, so that the third interference light interferes with the vision of a third voyeur on the display panel from the front side of the display panel and outside the legal viewing direction range, wherein the direction of the third interference light is different from the direction of the first interference light; A fourth interference light is generated by a fourth interference light source of the display device, wherein a fourth liquid crystal lens of the display device is disposed in the path of the fourth interference light source, and the fourth interference light source and the fourth liquid crystal lens are disposed on the second side of the display area of ​​the display panel; and the fourth liquid crystal lens is controlled according to the legal viewing direction range to dynamically change the direction of the fourth interference light, so that the fourth interference light interferes with the vision of a fourth voyeur on the front side of the display panel and outside the legal viewing direction range, wherein the direction of the fourth interference light is different from the direction of the second interference light.

18. The anti-peeping method as claimed in claim 12, wherein the display panel includes a liquid crystal display panel, and the anti-peeping method further includes: A backlight generated by a backlight source of the display device is provided to the display panel through a light guide plate. A backlight module of the display device is disposed on the rear side of the display panel. The backlight module includes the light guide plate, a reflective sheet, the backlight source, and a light path adjustment film. The light guide plate is disposed between the display panel and the reflective sheet. The backlight source is disposed on one side of the light guide plate. The light path adjustment film is disposed between the display panel and the light guide plate. A first side of the light path adjustment film has a first optical microstructure. A first interference light source and a first liquid crystal lens are disposed behind the display panel. The backlight source serves as the first interference light source, and the first liquid crystal lens is disposed between the backlight source and the light guide plate. A first portion of the light generated by the backlight source is directed onto the light guide plate by the first liquid crystal lens as the backlight. A second portion of the light generated by the backlight source is used as the first interference light by the first liquid crystal lens. The first liquid crystal lens directs the first interference light toward the first optical microstructure of the light path adjustment film; and the first optical microstructure directs the first interference light toward the voyeur on the front side of the display panel and outside the legal viewing direction, so as to interfere with the voyeur's viewing of the display panel.

19. The anti-peeping method as claimed in claim 18, wherein the backlight module further includes a side reflector and a second liquid crystal lens, the side reflector and the backlight source are respectively disposed on opposite sides of the light guide plate, the second liquid crystal lens is disposed between the side reflector and the light guide plate, a second side of the light path adjustment film has a second optical microstructure, and the anti-peeping method further includes: The side reflector reflects the first portion of the light from the first liquid crystal lens and through the light guide plate as a second backlight; The second liquid crystal lens directs a third portion of the second backlight as a third backlight onto the light guide plate; the second liquid crystal lens directs a fourth portion of the second backlight as a second interference light; the second liquid crystal lens directs the second interference light toward the second optical microstructure of the light path adjustment film; and the second optical microstructure directs the second interference light toward a second voyeur on the front side of the display panel and outside the legal viewing direction, so as to interfere with the second voyeur's viewing of the display panel.

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